How specific does needs to be target in MILD Dream Sign Intention?

[MisakaMikoto]

Hi Dreamviews, I've got a quick question relating to MILD and Dream Signs How specific does Dream Sign have to be? Let's say for example a straight one would be seeing a cowboy in red hat And not so specific would be seeing human. I'd like to use for my MILD Attempts doing reality check whenever i see any human and i'm not sure if something so unspecific would work Example: 'Whenever i see any human i'il remember to do reality check or try to recall what i was doing before to figure out that i'm dreaming' - Thanks